Inclusive Semileptonic B and Polarized Λb Decays from QCD
نویسندگان
چکیده
The differential decay spectrum dΓ/dEedq 2 for the semileptonic decay of an unpolarized hadron containing a b-quark, and the decay spectrum dΓ/dEedq dcos θ for polarized Λb decay are computed to second order in the 1/mb expansion. Most of the 1/m 2 b corrections have a simple physical interpretation, which is discussed in detail. The implications of the results for the determination of Vub are discussed. The decay spectra for semileptonic decay of hadrons containing a c-quark are also given. There is a subtlety in the use of the equations of motion at order 1/mb in the heavy quark expansion which is explained. UCSD/PTH 93-14 CALT-68-1883 hep-ph/9308246 August 1993
منابع مشابه
Strong Corrections to Inclusive B → Xτν τ Decays
We calculate the αs corrections to the form factors which parameterize the hadronic tensor relevant for inclusive semileptonic B → Xτντ and Λb → Xτντ decays. We apply our results to the double differential decay rates for the decays of B mesons and polarized Λb baryons to polarized τ leptons, presenting them in terms of one-dimensional integrals. Formulas appropriate for insertion into a Monte-...
متن کاملQCD Corrections to Inclusive Distributions of Leptons in Decays of Polarised Heavy Quarks*
Compact analytic expressions have been obtained for the first order perturbative QCD corrections to the inclusive spectra of the leptons in the semileptonic decays of polarised heavy quarks. Charmed and beautiful Λ baryons from Z decays can be viewed as sources of highly polarised charm and bottom quarks. Charged leptons and neutrinos from Λb and Λc decays can be used in the polarisation studie...
متن کاملInclusive Decays of Bottom Hadrons in New Formulation of Heavy Quark Effective Field Theory
We apply the new formulation of heavy quark effective field theory (HQEFT) to the inclusive decays of bottom hadrons. The long-term ambiguity of using heavy quark mass or heavy hadron mass for inclusive decays is clarified within the framework of the new formulation of HQEFT. The 1/mb order corrections are absent and contributions from 1/mb terms are calculated in detail. This enables us to rel...
متن کامل0 v 2 8 D ec 1 99 9 Applicability of perturbative QCD to Λ b → Λ c decays
We develop perturbative QCD factorization theorem for the semileptonic heavy baryon decay Λb → Λclν̄, whose form factors are expressed as the convolutions of hard b quark decay amplitudes with universal Λb and Λc baryon wave functions. Large logarithmic corrections are organized to all orders by the Sudakov resummation, which renders perturbative expansions more reliable. It is observed that per...
متن کاملSemileptonic Decays of B Mesons
In this section, we discuss some of the key questions related to semileptonic decays of B mesons: the inclusive semileptonic branching fraction, the determination of jV cb j and jV ub j from inclusive and exclusive measurements, recent progress in exclusive semileptonic decays, and form factor measurements and tests of heavy-quark eeective theory. We emphasize the uncertainties that arise in ex...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1994